Shakespeare Poem by Pac ??? Where is that from ?

[Yaki]

There are times
I've suffered shipwreck in my journeys
In perils of robbers
In perils of false brethren
In perils of my own design
Yet, from these perils comes knowledge
Only from within may we truly shine
- Tupac Shakur


Can anyone tell me where that exactly coems from ?? This poem is nor really in The RoseThat..." , right ??? Is it Shakespeare inspíred?? Does anybody have knowledge on this ??

Please, hurry I could need it for my Academic REsearch Paper on Pac at University!!